Detroit Diesel Fault Code

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SPN 111 FMI 1

Stop Engine Lamp / Hard Cutout

System

Cooling

Symptom

Stop Engine Lamp / Hard Cutout

Diagnosis & fix steps

LOGIC: Coolant Level Very Low (Engine Protection Level 3 Active). ACTION: Top off engine coolant surge tank. Inspect radiator, EGR cooler, and water pump weep hole for leaks. Verify level switch operation.

Red Seal field insights

Engine Safeguard: MCM cuts engine power within seconds of sensing empty surge tank to prevent catastrophic cylinder head cracking.

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